Portable tripod base



FIG. 1 is a rear top perspective view of a portable tripod base.

FIG. 2 is a front bottom perspective view of the portable tripod base.

FIG. 3 is a top plan view of the portable tripod base.

FIG. 4 is a bottom plan view of the portable tripod base.

FIG. 5 is a right side elevational view of the portable tripod base.

FIG. 6 is a left side elevational view of the portable tripod base.

FIG. 7 is a front elevational view of the portable tripod base; and,

FIG. 8 is a rear elevational view of the portable tripod base. 

CLAIM The ornamental design for a portable tripod base, as shown. 